Of course not. As the name implies, "Yu Di" is the emperor's younger brother. Although the Tang Priest is not related to the royal family at all, in the film and television of the 13th year of Emperor Taizong's Zhenguan, in order to obtain the Mahayana Sutra, Emperor Taizong Li Shimin issued a notice to seek talents all over the world. At that time, Tang Xuanzang was a famous monk in Hongfu Temple. Hearing this, he volunteered himself to Emperor Taizong, saying that he would "help the country". Emperor Taizong was also a wise monarch. Li Shimin, the emperor of the Tang Dynasty, had a very good relationship with Tang Priest before he went to the Western Heaven to learn Buddhist scriptures alone. At that time, he worshipped four times in the temple where Tang Xuanzang practiced, calling himself "the holy monk of Yu Di". In order to travel on the way to the Western Heaven to learn Buddhist scriptures, it is easier to reach the Western Heaven to learn Buddhist scriptures, and also to spread the culture of the Tang Dynasty in other countries. At that time, Xuanzang swore in front of the Buddha that he would "never go back to China until he got the Buddhist scriptures in the Western Heaven, never go to hell, and never live up to the high hopes of Emperor Taizong", and then he set off alone.

On the way to get the true scriptures, the customs clearance documents indicated that he was the royal brother of the Tang Dynasty in Dongtu. Sure enough, with this name, Tang Priest received courtesy from many countries along the way and made great contributions to the friendly development between countries.

Passing through the girl country (girl country), the king of the girl country heard the female official say that Tang Priest had come to seek truth from the Tang Dynasty.

The girl country is full of women, but no men. For the girl country, men are rare. The well-proportioned tree of Tang Priest is handsome and full of scriptures. The deeds of tempering all the way also made the king of his daughter country secretly love him, and he had a love for his children. During this period, he took care of Tang Xuanzang, affectionately calling Tang Priest the "Royal Brother". But I have no intention of being a lover, and Tang Priest is not moved by this beauty. He still sticks to his true heart, not for the sake of loving children but for the sake of being irresponsible to the country and Emperor Taizong.

The above is the origin of "royal brother", a relationship between monarch and minister, which broke the relationship between men and women. Although the relationship between men and women failed, the relationship between the king of the daughter country and the Tang priest left a deep impression on the audience, and the title of "Yu Di" was also widely known.